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"I was introduced to fidget spinners a few months ago by professor Kenneth Brecher from BU [Boston University]," said Paul Doherty, a physicist at the Exploratorium in San Francisco. "He makes his own spinning toys and handed me a fidget spinner and asked me to guess what it was. I described what it did but had no idea why someone would buy one ;-)," Doherty told Live Science in an email. For Doherty, the spinners are interesting for another reason: "To me, these show the coolness of ball bearings that reduce friction and allow things to rotate freely for a long time." (On a basic level, friction is the resistance to motion that occurs when one object moves relative to another. Here's a look at what's happening when your child, or you, balance a fidget spinner on your finger and give it a whirl.